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Updated: Aug 12, 2026

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Charge-transfer reactions in atom scattering from ionic surfaces: a time-dependent wavepacket approach
G R Darling1, Y Zeiri, R Kosloff
1Surface Science Research Centre, Department of Chemistry, University of Liverpool, Liverpool, UK L69 3BX.
Abstract:
A diabetic description of charge transfer between atoms and ionic surfaces is presented, specifically examining the F/LiF(100) and F/KI(100) systems for which experiment shows ion formation to be very efficient. Potential energy surfaces describing the energetics for these systems have been generated with a semi-empirical scheme. At the site of charge exchange, there is a curve-crossing between the ground state and the state representing charge capture by the projectile. Quantum dynamics calculations with time-dependent wavepacket methods give an initial ion-formation probability of unity for all cases considered. At lowest energies, the ions cannot escape the surface, giving an effective threshold for negative-ion production very close to that observed in experiment. Re-neutralization by charge transfer back to the conduction band of the solid is also examined.
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